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Collect.js | transform() Function

  • Last Updated : 04 Jun, 2020
Geek Week

The transform() function iterates over a collection and callback each item in the collection, the items inside the collection are replaced by the new callback values. It is similar to the JavaScript map() function but the values got replaced in transform() function.
In JavaScript, the array is first converted to a collection and then the function is applied to the collection.


data.transform(item, key)

Parameters: This function accepts two parameter as mentioned above and described below:

  • item: This parameter holds the collection item.
  • key: This parameter holds new operational value.

Return Value: Returns an modified array which is created by this function.

Below examples illustrate the transform() function in collect.js

Example 1: Here in this example, we take a collection and then using the transform() function modified the values using the key transformation parameter and return the new value.

// It is used to import collect.js library
const collect = require('collect.js');
const data= collect([1, 2, 3, 4, 5]);
data.transform((item, key) => item * 5);


[5 , 10 , 15 , 20 , 25 ]

Example 2: Same thing we have done here as above example.

// It is used to import collect.js library
const collect = require('collect.js');
const x= collect([10, 20, 30, 40, 50]);
x.transform((item, key) => item / 10);


[1 , 2 , 3 , 4 , 5 ]


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